synth_tools

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Unused row_7 = row_6 + vertical_space/7; cv_in_1a = [left_col, row_7, 0]; cv_in_1b = [right_col, row_5, 0]; audio_out_1 = [right_col, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_3, 0]; pwm_duty = [input_column, bottom_row, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [h_margin+working_width/8, row_3, 0]; c_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [second_col, first_row, 0]; sync_in = [first_col, fourth_row, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_4, 0]; left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2; // draw a "vertical" wall to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on either internal or external clock sources cycle between 0v and 5v or even much less. - One potentiometer per step, to set clock.

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